I like both, but I guess I prefer third person. Also, I usually get 3rd person games for console, because I prefer to play them with a controller (or just use PS3 controller on PC) and first person games for PC because keyboard + mouse > controller.
Jiggy Says...3rd person lol
IT depends very very deeply on the way its gonna play. What I mean? For me a Third Person should be when you will have tons of powers, customes, different physical apperance, Gonna do a lot of things that will be fun or visually good to see etc etc. When its a straight forward game in FPS like COD or Bioshock, BF, Borderlands etc etc I really like it that way in FPS.
Its my opinion but love them both.